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Jac Londe

Scientists capture first direct images of theoretically predicted magnetic monopoles - 19 views

  • first direct images of
  • magnetic monopoles
  • Image representing 12 micrometer x 12 micrometer of artificial magnetic metamaterial where monopoles can be seen at each end of the Dirac strings, visible as dark lines. The dark regions correspond to magnetic islands where the magnetization is reversed. (Image courtesy of Paul Scherrer Institute)
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  • “A magnetic monopole is a ‘hypothetical’ particle that is a magnet with only one single magnetic pole,” says UCD Theoretical Physicist, Professor Hans-Benjamin Braun from the UCD School of Physics, who co-led the study with Dr Laura Heyderman from the Paul Scherrer Institute in Switzerland.
  • “Some of the most important theories explaining how quantum matter behaves in the universe are based on their existence, but they have eluded direct imaging since they were first theoretically conceived in the 1930s.”
  • Initially conceived by the British-Swiss theoretical physicist Dirac in 1931, monopoles were proposed to occur as emergent quasiparticles in so called pyrochlore spin-ice systems by Castelnovo, Moessner and Sondhi in 2008.
Mark Glynn

The Cell Cycle & Mitosis Tutorial - 22 views

  • se, anaphase, and telopha
  • s, although a dark spot called the nucleolus may be visible. The cell may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules.
  • of the cell and fibers extend from the centromeres. Some fibers cross the cell to form the m
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  • eres creating the kinetochores. Microtubules attach at the kinetochores and the chromosomes
robert morris

Education Theory/Constructivism and Social Constructivism - UCD - CTAG - 56 views

  • Deep roots classical antiquity. Socrates, in dialogue with his followers, asked directed questions that led his students to realize for themselves the weaknesses in their thinking.
    • Manuel Condoleon
       
      Good link to Socrates
    • robert morris
       
      I think this is the essence of teaching and learning - asking questions, for nothing is really true.
  • Emphasis is on the collaborative nature of learning and the importance of cultural and social context.
    • robert morris
       
      I agree - context, and culture play a very important role. And this might change from corner to corner, it can change quickly, neighbours etc
  • Believed that constructivists such as Piaget had overlooked the essentially social nature of language and consequently failed to understand that learning is a collaborative process.
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  • Constructivist learning environments provide multiple representations of reality
  • Multiple representations avoid oversimplification and represent the complexity of the real world
  • Constructivist learning environments emphasize authentic tasks in a meaningful context rather than abstract instruction out of context.
  • Constructivist learning environments provide learning environments such as real-world settings or case-based learnin
  • Constructivist learning environments encourage thoughtful reflection on experience.
  • Constructivist learning environments support "collaborative construction of knowledge through social negotiation, not competition among learners for recognition.
  • Jonassen (1994)
  • There is no absolute knowledge, just our interpretation of it. The acquisition of knowledge therefore requires the individual to consider the information and - based on their past experiences, personal views, and cultural background - construct an interpretation of the information that is being presented to them.
  • Teaching styles based on this approach therefore mark a conscious effort to move from these ‘traditional, objectivist models didactic, memory-oriented transmission models’ (Cannella & Reiff, 1994) to a more student-centred approach.
  • Students ‘construct’ their own meaning by building on their previous knowledge and experience. New ideas and experiences are matched against existing knowledge, and the learner constructs new or adapted rules to make sense of the world
  • John Dewey (1933/1998) is often cited as the philosophical founder of this approach
  • while Vygotsky (1978) is the major theorist among the social constructivists.
  • Bruner (1990) and Piaget (1972) are considered the chief theorists among the cogn
  • Dewey
  • Piaget
  • John Dewey rejected the notion that schools should focus on repetitive, rote memorization & proposed a method of "directed living" – students would engage in real-world, practical workshops in which they would demonstrate their knowledge through creativity and collaboration
  • Piaget rejected the idea that learning was the passive assimilation of given knowledge. Instead, he proposed that learning is a dynamic process comprising successive stages of adaption to reality during which learners actively construct knowledge by creating and testing their own theories of the world.
  • A common misunderstanding regarding constructivism is that instructors should never tell students anything directly but, instead, should always allow them to construct knowledge for themselves. This is actually confusing a theory of pedagogy (teaching) with a theory of knowing. Constructivism assumes that all knowledge is constructed from the learner’s previous knowledge, regardless of how one is taught. Thus, even listening to a lecture involves active attempts to construct new knowledge.
  • social interaction lay at the root of good learning.
  • Bruner builds on the Socratic tradition of learning through dialogue, encouraging the learner to come to enlighten themselves through reflection
  • Careful curriculum design is essential so that one area builds upon the other. Learning must therefore be a process of discovery where learners build their own knowledge, with the active dialogue of teachers, building on their existing knowledge.
  • Social constructivism was developed by Vygotsky. He rejected the assumption made by Piaget that it was possible to separate learning from its social context.
    • robert morris
       
      On Vgotsky`s side here - I don`t think you can forget the role of "social learning", peer to peer learning and the role of social interaction.
  • The basic tenet of constructivism is that students learn by doing rather than observing.
  • By the 1980s the research of Dewey and Vygotsky had blended with Piaget's work in developmental psychology into the broad approach of constructivism
  • 1. Discovery Learning (Bruner) In discovery learning, the student is placed in problem solving situations where they are required to draw on past experiences and existing knowledge to discover facts, relationships, and new information. Students are more likely to retain knowledge attained by engaging real-world and contextualised problem-solving than by traditional transmission methods. Models that are based upon discovery learning model include: guided discovery, problem-based learning, simulation-based learning, case-based learning, and incidental learning.
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